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Sitting on furniture should give half the willpower/endurance regeneration that meditating/sleeping gives.
It would mean that while sitting around in your city while exhausted you can still interact with people and not feel like an idiot for not sleeping/meditating, it would be suboptimal regeneration compared to sleeping/meditating so people would still do that.
Pros: allows people who spend all their time bashing to interact with people during down time.
Cons: for jumping purposes might have people in groups at gathering places rather than alone in a house
I am sure having endurance/willpower serves some purpose that I'm not aware of
Half might be too much with the split, since you can't meditate and sleep at the same time. It might be more efficient to just rest on a seat if you use both willpower and endurance.